Optical pickup device and collimate lens
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first embodiment
[0099]With reference to FIG. 1, there will be described a structure of an optical pickup device 101 according to a first embodiment of the present invention.
[0100]The optical pickup device 101 according to the present embodiment is an optical pickup device which records and plays back information, by condensing a luminous flux emitted from a light source toward an optical disc as an optical recording medium, onto the optical recording medium through a light-condensing optical system. This optical pickup device 101 generally includes the light source, a first coma-aberration correction actuator and a second coma-aberration correction actuator. In this case, the first and second coma-aberration correction actuators constitute a portion of the light-condensing optical system. Further, the first coma-aberration correction actuator includes a first tilt drive portion for inclining, in a first tilt direction, an objective lens for converging the emitted light to the optical disc. The seco...
second embodiment
[0195]Hereinafter, an optical pickup device according to a second embodiment of the present invention will be described, with reference to the drawings.
[0196]FIG. 11 is a structural view illustrating the structure of a collimating lens actuator 7-2 in the optical pickup device according to the second embodiment.
[0197]Referring to FIG. 11, the collimating lens actuator 7-2 is different from the collimating lens actuator 7 illustrated in FIG. 2, in that the movable magnets 62 and the fixed tangential tilt coils 63 in the tangential tilt drive portion in the collimating lens actuator 7 are replaced with fixed magnets 66 and a movable tangential tilt coil 67 in the collimating lens actuator 7-2 according to the second embodiment. No changes are made to the other components of the collimating lens actuator 7-2, and the components having the same functions as those of the collimating lens actuator 7 are designated by the same reference characters.
[0198]Accordingly, hereinafter, the collim...
third embodiment
[0201]Hereinafter, an optical pickup device according to a third embodiment of the present invention will be described, with reference to the drawings.
[0202]FIG. 12 is a structural view illustrating the structure of a collimating lens actuator 7-3 in the optical pickup device according to the third embodiment.
[0203]Referring to FIG. 12, the collimating lens actuator 7-3 is different from the collimating lens actuator 7 illustrated in FIG. 2, in that the movable magnets 62 and the fixed tangential tilt coils 63 in the tangential tilt drive portion in the collimating lens actuator 7 are replaced with a piezoelectric device 68 in the collimating lens actuator 7-3 according to the third embodiment. No changes are made to the other components of the collimating lens actuator 7-2, and the components having the same functions as those of the collimating lens actuator 7 are designated by the same reference characters.
[0204]Accordingly, hereinafter, the collimating lens actuator 7-3 will be ...
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